A metal-calixarene coordination nanotube with 5-(pyrimidin-5-yl)isophthalic acid

Abstract

A metal-organic nanotube (MONT) was assembled by bridging the truncated metal-calixarene octahedra with coordinating water molecules. Remarkably, the tubular compound exhibited a much higher sorption capacity for CH and CH than for CH, and hence represents a promising material for separating these gases. The addition of a little NiSO into the reaction system led to the formation of a 2D metal-calixarene network.

A New Heterometallic CuII‐LaIII Metal‐organic Framework: Crystal Structure, Adsorption of Light Hydrocarbons and Anti‐gastric Cancer Activity

“…As shown in Figure b, 1′ shows good light hydrocarbons adsorption performance with the adsorption capacity of 74.6 cm 3 · g –1 for C 3 H 8 , 69.2 cm 3 · g –1 for C 2 H 6 , 62.3 cm 3 · g –1 for C 2 H 4 , and 17.5 cm 3 · g –1 for CH 4 , respectively. Although the light hydrocarbons adsorption capacities of 1′ are significantly lower than the previously reported MOFs ([ M 2 (DHTP)] series) with larger density of unsaturated metal sites and much higher BET surface areas, they are still comparable to those of some MOFs with larger pore volumes such as CIAC ‐ 124 and eea ‐ MOF ‐ 4 , which might be attributed to the presence of open Cu II and La III sites in 1′ as well as the suitable pore size that could form a strong van der Waals force with the absorbed gases . It is noteworthy that the adsorption capacities follow the order of C 3 H 8 > C 2 H 6 > C 2 H 4 > CH 4 , and this may be attributed to the different polarizabilities of these gas molecules (CH 4 = 25 × 10 –25 , C 2 H 4 = 42.50 × 10 –25 , C 2 H 6 = 44 × 10 –25 , and C 3 H 8 = 64 × 10 –25 cm 3 ).…”

Thiacalixarene-Supported Irregular Co26 and Ni28 High-Nuclearity Clusters with Pyridyl-Diphosphonates: Strategies to Create Active Metal Sites and Fabricate Multicomponent Materials

“…To the best of our knowledge, though many types of coordination modes of the ligand H 5 L have been reported (Table S3), − the ligand in this work exhibits five new coordination modes with up to 11 metals. Auxiliary ligands with pyridine − or single phosphate/phosphonate group ,− have been applied to construct various high-nuclearity metal clusters with thiacalix[4]­arene and its derivatives. However, the reported metal clusters commonly represented symmetrical assembly with less possible coordinatively unsaturated metal sites (PCUMSs) (Table S4).…”

“…To achieve such a goal, auxiliary ligands with different coordination sites and asymmetry nature may facilitate assembly of PCCs with labile bonds. The 1-hydroxy-2-(3-pyridinyl)­ethylidene-1,1-diphosphonic acid (risedronic acid, H 5 L, Scheme b) has been proven to be an efficient multidentate ligand with diversified coordination modes and excellent coordination ability to metal ions due to its eight potential coordination sites. − It may be a good choice and convenient for the construction of calixarene-based PCCs with rich labile coordination bonds based on the following considerations: (i) N coordination site of pyridine ligands usually bond to metal ions in monodentate mode with an average coordination hindrance; − (ii) the phosphate/phosphonate ligands (two pairs for H 5 L) with three coordinatively active oxygen can capture more metal ions with various modes; ,− (iii) the hydroxyl site located in the middle of H 5 L is readily for binding additional metal sites; (iv) the high asymmetry nature of H 5 L. − …”

Porous nickel and cobalt hexanuclear ring-like clusters built from two different kind of calixarene ligands – new molecular traps for small volatile molecules

“…44,45 When functionalized with four methylenecarboxylic groups, p-tert-butylthiacalix [4]arene enhances its receptor capacity and affinity towards water and aliphatic alcohols (methanol and ethanol) 46 and carboxylic acids. 47 For the extended coordination networks based on calixarenes, one can note a 2D nanotube, built from p-tertbutylthiacalix [4]arene, that represents a promising material for separating C2H6 and C3H8 from CH4 48 and also a 3D coordination network based on modified p-tert-butylthiacalix [4]arene exhibiting substantial CO2 uptake. 49 Another interesting example was coming from a solid obtained from a mixture of Calix [4]arene derivatives and polyoxometalate, displaying a porous structure, and unique guest binding properties.…”